CHM 13 Ppt.1

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DesLee26
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CHM 13 Ppt.1
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2013-03-19 17:22:45
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CHM 112
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Ch 13
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  1. chemical equilibrium
    the state achieved when the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain constant
  2. Equilibrium between phases is known as __
    physical equilibrium
  3. For a general reversible reaction:
    aA + bB <--> cC + dD
  4. Equalibrium equation
    • Kc= [C]c[D]d/ [A]a[B]b
    • where hte numerator is the product
    • where the denominator is the reactants
    • Kc= equilibrium constant
  5. The __ and the __ are for the chemical equation as __
    • equilibrium constant
    • equilirbrium constant expression
    • written
  6. What are the exponents?
    they are going to be the exponents
  7. Homogeneous equilibrium
    when all reacting species are in hte same phase, all reactants and products are included in the expression
  8. Amounts of components are given as __ or __ of a gas.
    • molarity
    • partial pressure
  9. Kp equation
    • Kp= (P NO2)^2 / PN2O4
    • where P is the partial pressure
  10. Euation to convert between Kc and Kp
    • Kp=Kc (RT)^deltan
    • where delta n= mole gas products- mole of gas reactants
    • R is the gas constant, 0.08206
    • T is temp in K
  11. Heterogeneous equilibrium
    when reacting species are in different phases, solid and liquid phases are excluded from the expression because their concentrations "do not change"
  12. Write the equilibrium equation for each of the following reactions? 
    1) CO2 (g) + C (s) <--> 2 CO
    1) Kc = [CO]2/ [CO2]
  13. Write the equilibrium equation for each of the following reactions? 
    2) Hg (l) + Hg 2+ (aq) <--> Hg22+ (aq)
    k= [Hg22+ ]/ [Hg2+]
  14. We can make the following generalizations concerning the composition of equilibrium mixtures
    If Kc > 10^3, __
    • products predominate over reactants. 
    • If Kc is very large, the reaction is said to proceed to completion
  15. We can make the following generalizations concerning the composition of equilibrium mixtures
    If Kc is in the range of 10^-3 to 10^3, __
    appreciable concentrations of both reactants and products are present
  16. We can make the following generalizations concerning the composition of equilibrium mixtures
    If Kc < 10^-3, __
    reactants predominate over products. If Kc is very small, the reaction proceeds hardly at all
  17. Reaction Quotient
    Qc= [C]t^c [D]t^d / [A]t^a [B]t^b
  18. The __, is defined in the same way as the __, except that the concentrations in Qc are not necessarily __.
    • reaction quotient (Qc)
    • equilibrium constant (Kc)
    • equilibrium values
  19. How is the reaciton quotient (Qc) obtianed?
    by substituting initial concentraitons into the equilibrium constant; predicts reaction direction
  20. Qc > Kc
    system proceeds to form reactants
  21. Qc < Kc
    System proceeds to form products
  22. Qc = Kc
    system is at equilibrium
  23. Knowing Kc allows us to calculate __ from __. We use the __.
    • equilibrium concentrations
    • initial concentratiions
    • Initial Change Equilibrium Method

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